U.S. patent application number 11/264172 was filed with the patent office on 2006-11-09 for image forming apparatus.
This patent application is currently assigned to FUJI XEROX CO., LTD.. Invention is credited to Tsutomu Ishii, Minoru Koshimizu, Ikutaroh Nagatsuka, Yasunori Saito.
Application Number | 20060251380 11/264172 |
Document ID | / |
Family ID | 37394121 |
Filed Date | 2006-11-09 |
United States Patent
Application |
20060251380 |
Kind Code |
A1 |
Saito; Yasunori ; et
al. |
November 9, 2006 |
Image forming apparatus
Abstract
An image forming apparatus writes an image to a display
recording medium at a write position. The image forming apparatus
includes an insertion slot, a transport unit, an image light
emitting device and a separating/contacting unit. The display
recording medium is inserted into the insertion slot. The transport
unit transports the display recording medium inserted, to/from the
write position. The image light emitting device includes an
emitting surface that emits two-dimensional image light for
irradiating a photoconductive layer of the display recording medium
at the write position. The separating/contacting unit brings the
emitting surface separate from a display recording medium surface
when the display recording medium is not opposed to the image light
emitting device, while the transport unit transports the display
recording medium. The separating/contacting unit brings the
emitting surface into proximity to the display recording medium
surface when the display recording medium is at the write
position.
Inventors: |
Saito; Yasunori; (Kanagawa,
JP) ; Nagatsuka; Ikutaroh; (Kanagawa, JP) ;
Ishii; Tsutomu; (Kanagawa, JP) ; Koshimizu;
Minoru; (Kanagawa, JP) |
Correspondence
Address: |
OLIFF & BERRIDGE, PLC
P.O. BOX 19928
ALEXANDRIA
VA
22320
US
|
Assignee: |
FUJI XEROX CO., LTD.
Tokyo
JP
|
Family ID: |
37394121 |
Appl. No.: |
11/264172 |
Filed: |
November 2, 2005 |
Current U.S.
Class: |
386/358 ;
386/326 |
Current CPC
Class: |
G03G 15/6597 20130101;
G03G 2215/00518 20130101 |
Class at
Publication: |
386/046 |
International
Class: |
H04N 5/91 20060101
H04N005/91 |
Foreign Application Data
Date |
Code |
Application Number |
May 9, 2005 |
JP |
2005-135861 |
Claims
1. An image forming apparatus for writing an image to a display
recording medium at a write position, wherein the recording medium
has a photoconductive layer and a display layer laminated to each
other, the display layer displaying in response to an electric
field distribution generated by two-dimensional image light
irradiated on the photoconductive layer, the apparatus comprising:
an insertion slot into which the display recording medium is
inserted; a transport unit that transports the display recording
medium inserted through the insertion slot, into and out of the
write position; an image light emitting device including an
emitting surface that emits the two-dimensional image light for
irradiating the photoconductive layer at the write position; a
separating/contacting unit that brings the emitting surface
separate from a display recording medium surface when the display
recording medium is not opposed to the image light emitting device,
and that brings the emitting surface into proximity to the display
recording medium surface when the display recording medium is at
the write position, while the display recording medium is
transported by the transport unit.
2. The image forming apparatus according to claim 1, further
comprising: a holder holding the image light emitting device;
wherein the holder is rotatably supported to have a free end on the
side of the insertion slot; and wherein the separating/contacting
unit includes a rotating unit that rotates the holder to bring the
image light emitting device separate from and in contact with the
display recording medium.
3. The image forming apparatus according to claim 2, wherein the
rotating unit includes a spring member that presses the holder to
the direction of the display recording medium and a rotation driver
that separates the holder from the display recording medium against
a pressing force of the spring member.
4. The image forming apparatus according to claim 3, wherein the
rotation driver includes a cam that separates the holder from the
display recording medium and a cam driver that rotatably drives the
cam.
5. The image forming apparatus according to claim 2, wherein the
rotating unit includes a rotary member disposed on the holder; and
wherein the rotary member separates the holder from the display
recording medium by using a force acting from the display recording
medium when the display recording medium is transported into or out
of the write position.
6. The image forming apparatus according to claim 5, wherein the
rotary member is a low-friction member that is in slidable contact
with the display recording medium to separate the holder from the
display recording medium.
7. The image forming apparatus according to claim 6, wherein the
display recording medium has a support body having a display
surface and a frame, the frame disposed adjacently to and
co-planarly with the display surface; and wherein the rotary member
is disposed in contact with the frame.
8. The image forming apparatus according to claim 6, wherein the
transport unit includes a guide member that guides the display
recording medium at least in the vicinity of the write position;
and wherein the guide member includes a recessed portion that
houses at least a part of the rotary member at a position opposite
to the rotary member.
9. The image forming apparatus according to claim 5, wherein the
rotary member is in rolling contact with the display recording
medium to separates the holder from the display recording
medium.
10. The image forming apparatus according to claim 9, wherein the
display recording medium has a support body having a display
surface and a frame, the frame disposed adjacently to and
co-planarly with the display surface; and wherein the rotary member
is disposed in contact with the frame.
11. The image forming apparatus according to claim 9, wherein the
transport unit includes a guide member that guides the display
recording medium at least in the vicinity of the write position;
and wherein the guide member includes a recessed portion that
houses at least apart of the rotary member at a position opposite
to the rotary member.
12. The image forming apparatus according to claim 9, wherein the
rotary member is a roller inclined to a transport-in direction of
the display recording medium.
13. The image forming apparatus according to claim 2, wherein the
rotating unit separates the holder downwardly from the display
recording medium in conjunction with a transport of the display
recording medium.
14. The image forming apparatus according to claim 1, wherein the
transport unit transports the display recording medium inserted
through the insertion slot into the write position, and transports
the display recording medium written with the image out to the
insertion slot.
15. The image forming apparatus according to claim 1, further
comprising: a discharge slot provided at a position that is in the
transport-in direction of the display recording medium.
16. The image forming apparatus according to claim 3, wherein the
spring member is disposed between both ends of the holder on the
free end side thereof.
17. The image forming apparatus according to claim 3, wherein the
spring member is disposed at least at two positions between which
the emitting surface is disposed in the axial direction of the
holder.
18. The image forming apparatus according to claim 1, wherein the
image light emitting device includes a flat display.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an image forming apparatus
that writes an image to a display recording medium capable of
displaying the image without power, by irradiating the display
recording medium with image light.
[0003] 2. Description of the Related Art
[0004] As a display recording medium, in addition to a paper medium
and an electronic display device, attention has recently been paid
to a display recording medium (also called digital paper) combining
the advantage of an electronic display and that of paper.
[0005] This display recording medium has memorability in display.
Therefore, it is only necessary that an image write device gives
write energy to the display recording medium only when information
is rewritten, and there is no need to give it any energy for
maintaining the display. Accordingly, after the information is
written, it is possible to separate the display recording medium
from the image write device, and thus it is possible, like the
paper medium, to readily carry it about and read the information
with a plurality of the display recording media stacked one on
another, placed side by side, or carried in hand.
[0006] As the display recording medium having memorability, there
are known a light write type display recording medium into which an
image is visibly and erasably stored by light irradiation and
voltage application, and an image write device that writes an image
to this display recording medium (e.g., see JP-A-2001-301233
([0031] to [0043] and FIGS. 1 and 2)).
[0007] In this display recording medium described in Patent
Document 1, a liquid crystal layer and a photoconductive layer that
varies in resistance value under light irradiation are laminated to
each other between a pair of transparent electrodes. Besides, the
image write device that writes an image to the display recording
medium is configured as follows. That is, the photoconductive layer
of the display recording medium is irradiated with a
two-dimensional light pattern via a two-dimensional microlens array
from an LCD (liquid crystal display) panel so that the light
pattern is focused onto the photoconductive layer. A resistance
distribution based on the light pattern is thus generated in the
photoconductive layer. A voltage is then applied between the
transparent electrodes via receiving ends, thereby applying to the
liquid crystal layer a voltage distribution based on the resistance
distribution of the photoconductive layer. An image responsive to
the voltage distribution is thus recorded on the liquid crystal
layer.
[0008] According to the image write device of the light write type
display recording medium, printing is enabled by exposing image
information in a planar fashion while applying a voltage to the
entire pair of electrodes. Therefore, this makes it possible to
write large-capacity image information at high speed as compared
with line exposure and scan exposure.
SUMMARY OF THE INVENTION
[0009] However, according to the existing image write device, in
the case of recording an image to the display recording medium as
transported below a write portion, when the display recording
medium is transported in close contact with the LCD panel, in some
cases, the LCD panel is scraped and scratched on its surface or,
what is worse, the LCD panel is thereby damaged. Accordingly, it is
preferred that the display recording medium and the LCD panel make
no close contact with each other during transport of the display
recording medium and it is preferred that make close contact with
each other during printing or that a narrow gap is formed between
the display recording medium and the LCD panel during printing.
[0010] On the other hand, as the configuration of preventing the
scrape between display recording medium and the LCD panel, the
following lift mechanism can be considered. That is, the display
recording medium inserted in the image write device is transported
by a transport mechanism so as to be kept out of contact with the
LCD panel, and the display recording medium surface is thus brought
into proximity to the LCD panel side when opposed to the LCD panel.
However, the transport mechanism for transporting the display
recording medium to a portion thereof opposite the LCD panel need
to be in conjunction with a separating/contacting mechanism for
bringing the display recording medium out of and into contact with
the LCD panel. Therefore, the transport mechanism must be moved up
and down in conjunction not only with the display recording medium
separating/contacting mechanism but also with part of the transport
path of the display recording medium transport mechanism. Thus,
there is the problem in which the apparatus is complicated in
configuration and particularly is increased in thickness in a
separating/contacting direction that is the direction of the
display recording medium surface, which is likely to hinder a
reduction in thickness of the apparatus.
[0011] The present invention has been made in view of the above
circumstances and provides an image forming apparatus that is of
small size and is configured to prevent an image light emitting
device from being damaged by a display recording medium being
transported.
[0012] The present invention may provide an image forming apparatus
for writing an image to a display recording medium at a write
position. The recording medium has a photoconductive layer and a
display layer laminated to each other. The display layer displays
in response to an electric field distribution generated by
two-dimensional image light irradiated on the photoconductive
layer. The apparatus includes an insertion slot, a transport unit,
an image light emitting device and a separating/contacting unit.
The display recording medium is inserted into the insertion slot.
The transport unit transports the display recording medium inserted
through the insertion slot, into and out of the write position. The
image light emitting device includes an emitting surface that emits
the two-dimensional image light for irradiating the photoconductive
layer at the write position. The separating/contacting unit brings
the emitting surface separate from a display recording medium
surface when the display recording medium is not opposed to the
image light emitting device, while the display recording medium is
transported by the transport unit. And the separating/contacting
unit brings the emitting surface into proximity to the display
recording medium surface when the display recording medium is at
the write position, while the display recording medium is
transported by the transport unit.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Preferred embodiments of the present invention will be
described in detail based on the following figures, wherein:
[0014] FIG. 1 is a perspective view showing an image forming
apparatus according to a first embodiment of the invention;
[0015] FIG. 2 is a block diagram showing the control system
configuration of a controller and image write unit in FIG. 1;
[0016] FIG. 3 is a plan view showing the internal configuration of
the image write unit in FIG. 1;
[0017] FIGS. 4A to 4C are section views showing respective portions
of the image write unit in FIG. 3, wherein FIG. 4A is a section
view taken along line A-A, FIG. 4B is a section view taken along
line B-B, and FIG. 4C is a section view taken along line C-C;
[0018] FIG. 5 is a section view taken along line 5-5 of FIG. 3;
[0019] FIG. 6 is a section view showing the layer configuration of
the display recording medium of the first embodiment;
[0020] FIG. 7 is a front section view showing the configuration of
an image write unit according to a second embodiment of the
invention;
[0021] FIGS. 8A to 8E are views showing an image write unit
according to a third embodiment of the invention, wherein FIG. 8A
is a front view showing the state of the image write unit before
the display recording medium is transported in, FIG. 8B is a front
view showing the state of the image write unit immediately after
the display recording medium is inserted, FIG. 8C is a front view
showing the state of the image write unit after the display
recording medium is completed being transported in, FIG. 8D is a
section view taken along line 8D-8D of FIG. 8A, and FIG. 8E is a
section view taken along line 8E-8E of FIG. 8A;
[0022] FIGS. 9A to 9E are views showing an image write unit
according to a fourth embodiment of the invention, wherein FIG. 9A
is a front view showing the state of the image write unit before
the display recording medium is transported in, FIG. 9B is a front
view showing the state of the image write unit immediately after
the display recording medium is inserted, FIG. 9C is a front view
showing the state of the image write unit after the display
recording medium is completed being transported in, FIG. 9D is a
section view taken along line 9D-9D of FIG. 9A, and FIG. 9E is a
section view taken along line 9E-9E of FIG. 9A;
[0023] FIG. 10 is a section view showing an image write unit
according to a fifth embodiment of the invention;
[0024] FIG. 11 is a plan view showing the outlined configuration of
an image write unit according to a sixth embodiment of the
invention;
[0025] FIGS. 12A to 12C are views showing the configuration of an
image write unit according to a seventh embodiment of the
invention, wherein FIG. 12A is a section view taken along line A-A
of FIG. 3, FIG. 12B is a section view taken along line B-B of FIG.
3, and FIG. 12C is a section view taken along line C-C of FIG.
3;
[0026] FIG. 13 is a side view showing the configuration of an image
write unit according to an eighth embodiment of the invention;
[0027] FIGS. 14A to 14C are views showing an image write unit
according to a ninth embodiment of the invention, wherein FIG. 14A
is a plan view, FIG. 14B is a front view showing the state of the
image write unit after the display recording medium is inserted,
and FIG. 14C is a front view showing the state of the image write
unit after the display recording medium is completed being
transported in; and
[0028] FIG. 15 is a section view showing the layer configuration of
an image recording medium according to a tenth embodiment of the
invention.
DETAILED DESCRIPTION OF THE INVENTION
First Embodiment
[0029] FIG. 1 shows the outline of an image forming apparatus
according to a first embodiment of the invention. This image
forming apparatus 100 includes a personal computer (PC) 1, a
controller 2 connected to this PC 1, and an image write unit 3 that
writes an image to a display recording medium 4 under control of
the controller 2. Additionally, the PC 1 and the controller 2 may
be configured into a single write instruction device.
[0030] The PC 1 transfers to the controller 2 image data to be
written to the display recording medium 4 and gives the controller
2 an image write instruction. The image data transferred to the
controller 2 includes image data created by operating the keyboard,
mouse, and the like of this PC 1 and image data acquired from the
external via a recording medium or a network.
[0031] The image write unit 3, having a substantially box-like
casing 310, has an insertion slot which is horizontally formed at
the front of the casing 310 and through which the display recording
medium 4 is inserted and discharged. Additionally, the image write
unit 3 may be configured to have the insertion slot 5 formed in a
vertical direction.
[0032] FIG. 2 shows the detailed configuration of the interior of
the controller 2 and image write unit 3.
[0033] The image write unit 3 includes a medium detection sensor
31, a medium transporter 32, an LCD panel 35, a lift driver 33, a
pair of leads 34, an LCD driver 36, and a light source 37. The
medium detection sensor 31 is made up of a light emitting element
and light receiving element which optically detect that the display
recording medium 4 has been inserted to a predetermined position
from the insertion slot 5. The medium transporter 32 transports the
inserted display recording medium 4 into a write position, and
transports the display recording medium 4 written with an image out
of the insertion slot 5. The LCD panel 35 serves as the image light
emitting device that irradiates the display recording medium 4 with
image light. The lift driver 33 serves as the separating/contacting
unit that separates a LCD holder described as follows, which holds
the LCD panel 35, from the write position for writing to the
display recording medium 4. The pair of leads 34 is capable of
contacting a pair of receiving ends 407 of the display recording
medium 4. The LCD driver 36 drives the LCD panel 35. And, the light
source 37 is made up of an LED or the like that serves as a
backlight of the LCD panel 35.
[0034] The controller 2 includes a control section 20 configured by
using a CPU or the like, an image memory 21 that stores the image
data, a pulse power supply 22 that generates a drive voltage to be
applied to the display recording medium 4, and a power supply 23
that supplies power to each section of the image write unit 3.
[0035] The control section 20 is configured to control the lift
driver 33 in conjunction with the transport of the display
recording medium 4 into/out of the write position.
[0036] FIG. 3 shows the display recording medium 4 and the internal
configuration of the image write unit 3. Besides, FIG. 4 shows
section views of respective portions of the image write unit 3 in
FIG. 3, wherein FIG. 4A is a section view taken along line A-A of
FIG. 3, FIG. 4B is a section view taken along line B-B of FIG. 3,
and FIG. 4C is a section view taken along line C-C of FIG. 3.
Furthermore, FIG. 5 is a section view taken along line 5-5 of FIG.
3.
[0037] The medium transporter 32 includes a pair of guide members
301A and 301B having a linear U cross-section shape, transport
rollers 303A, 303B, 304A, and 304B, stoppers 309A and 309B, and a
not-shown transport motor. The pair of guide members 301A and 301B,
disposed one on each side of the interior of the casing 310, guide
the display recording medium 4 inserted from the insertion slot 5.
The transport rollers 303A, 303B, 304A, and 304B are disposed,
facing a display recording medium 4 transport path, in notches
formed in the pair of guide members 301A and 301B. The stoppers
309A and 309B stop the transported display recording medium 4. And,
the not-shown transport motor rotationally drives the transport
rollers 303A, 303B, 304A, and 304B.
[0038] The LCD holder 307 that holds the LCD panel 35 is rotatably
supported by rotary shafts 308 projecting from both side surfaces
on the sides thereof in the transport-in direction of the display
recording medium 4. A projecting piece 311 that engages the upper
end of a compression spring 306 is provided on one side surface of
the LCD holder 307 at the center thereof. And, projecting pieces
302A and 302B that receive eccentric cams 305A and 305B are
provided on both side surfaces of the LCD holder 307 on the front
end side thereof. Additionally, the configuration may be such that
the projecting pieces 311 are provided on each of the right and
left sides of the LCD holder 307, and thus such that the LCD holder
307 are pressed by the right and left compression springs 306. This
can provide a balanced pressing force to the LCD holder 307.
[0039] The lift driver 33 includes the compression spring 306, the
eccentric cams 305A and 305B, and a not-shown lift motor. The
compression spring 306 upwardly presses the projecting piece 311 of
the LCD holder 307. The eccentric cams 305A and 305B are rotatably
supported on rotary shafts 312 and depress the projecting pieces
302A and 302B provided on the LCD holder 307 in response to their
rotation. And, the not-shown lift motor rotates the eccentric cams
305A and 305B.
[0040] FIG. 6 shows the layer structure of the display recording
medium 4. This display recording medium 4 includes a pair of
transparent substrates 401A and 401B, a pair of transparent
electrodes 402A and 402B, a liquid crystal layer 403, a
photoconductive layer 404, a light absorption layer 405, an
extending portion 406, the pair of receiving ends 407, a
resin-filled portion 408, and a separation layer 409. The pair of
transparent substrates 401A and 401B, made of PET (polyethylene
terephthalate) films, is disposed opposite each other. The pair of
transparent electrodes 402A and 402B, made of ITO (indium tin
oxide), are provided on the inner sides of the pair of substrates
401A and 401B. The liquid crystal layer 403 is provided on the
inner side of the transparent electrode 402A and is made of
cholesteric liquid crystals that vary in reflectance
(transmittance) according to an applied voltage. The
photoconductive layer 404 is disposed on the inner side of the
transparent electrode 402B and is formed so that its resistance
decreases as an image write display region 4c serving as a display
surface is irradiated with write pattern light 40. The light
absorption layer 405 is provided between the transparent electrode
402B and the photoconductive layer 404. The extending portion 406
extends from the transparent electrode 402B to the side of a rear
surface 4b. The pair of receiving ends 407 is formed to be
connected to the transparent electrode 402A and the extending
portion 406. The resin-filled portion 408 is filled with a resin to
fill the gap between the substrates 401A and 401B. And, the
separation layer 409 is provided between the liquid crystal layer
403 and the photoconductive layer 404. Besides, the display
recording medium 4 has a support body having a display surface and
a frame which disposed adjacently to and co-planarly with the
display surface.
[0041] (Operation of Image Forming Apparatus)
[0042] The operation of the image forming apparatus 100 will now be
described with reference to FIGS. 1 to 6.
[0043] (1) Insertion of Display Recording Medium
[0044] First, as shown in FIG. 1, a user inserts the display
recording medium 4 into the insertion slot 5 of the image write
unit 3 with the receiving ends 407 facing up and the insertion
side. When the display recording medium 4 is inserted to the
predetermined position, the medium detection sensor 31 detects the
insertion and transmits a medium detection signal to the controller
2.
[0045] (2) Separation of LCD Holder from Write Position
[0046] The control section 20 of the controller 2 rotationally
drives the not-shown lift motor of the lift driver 33 in a forward
direction, based on the medium detection signal from the medium
detection sensor 31. As shown in FIG. 4C, the cams 305A and 305B
are thus rotated about the rotary shaft 308 from direction A to B
to incline the LCD holder 307 from the solid line position to
dashed line position of FIG. 4C against the spring force of the
compression spring 306. That is, the control section 20 separates
the LCD holder 307 from the write position.
[0047] (3) Transport-in of Display Recording Medium
[0048] The control section 20 rotationally drives the not-shown
transport motor of the medium transporter 32 in a forward direction
at the same time as driving the lift driver 33 or after a
predetermined time elapses from the start of driving the lift
driver 33. The transport rollers 303A, 303B, 304A, and 304B are
thus rotated to transport the display recording medium 4 into the
back of the image write unit 3. The control section 20 stops the
rotation of the transport rollers 303A, 303B, 304A, and 304B with
such timing that the display recording medium 4 is transported and
one to two seconds elapses after the leading end thereof abuts the
stoppers 309A and 309B. On this occasion, the leads 34 are placed
in contact with the receiving ends of the display recording medium
4.
[0049] (4) Rotation of LCD Holder to Write Position
[0050] The control section 20 rotationally drives the lift motor of
the lift driver 33 in a reverse direction. The cams 305A and 305B
are thus rotated from direction B to A to rotate the LCD holder 307
from the dashed line position to solid line position of FIG. 4C.
The LCD holder 307 is upwardly pressed around the rotary shafts 308
by the spring force of the compression spring 306, and the LCD
panel 35 is thus positioned parallel to the display recording
medium 4. That is, the control section 20 positions the LCD holder
307 at the write position. On this occasion, the image write
display region 4c of the display recording medium 4 is opposed to
the LCD panel 35 with a slight gap (e.g., 100 to 500 .mu.m)
provided therebetween. Additionally, the image write display region
4c may make close contact with the LCD panel 35.
[0051] (5) Image Write
[0052] Next, the user operates the PC 1 to select an image intended
to be written to the display recording medium 4 and thus sends its
image data and write instruction to the controller 2. The
controller 2 stores into the image memory 21 the image data
transmitted from the PC 1 and also starts a write in accordance
with the write instruction.
[0053] The control section 20 of the controller 2 actuates the
power supply 21 to turn on the light source 37. Besides, the
control section 20 actuates the pulse power supply 22 to apply an
initialization voltage for initializing the display recording
medium 4, between the pair of receiving ends 407 before a normal
write operation. As the initialization voltage is thus applied,
total white or total black is displayed in the image write display
region 4c of the display recording medium 4. On this occasion, the
LCD driver 36 is not actuated. Additionally, total white or total
black may be displayed by applying the initialization voltage with
the LCD driver 36 actuated.
[0054] After the initialization is completed, the control section
20 applies a predetermined voltage to the pair of receiving ends
407 of the display recording medium 4 via the pair of leads 34 from
the pulse power supply 22. The control section 20 simultaneously
supplies the LCD driver 36 with a write signal responsive to the
image data stored by the image memory 21. The LCD driver 36 drives
the LCD panel 35 based on the write signal to irradiate the image
write display region 4c of the display recording medium 4 with the
write pattern light 40.
[0055] The write pattern light 40, with which the image write
display region 4c of the display recording medium 4 is irradiated,
reaches the photoconductive layer 404 via the substrate 401A,
transparent electrode 402A, liquid crystal layer 403, and
separation layer 409. The light irradiated portion of the
photoconductive layer 404 decreases in resistance value, whereby
the liquid crystal layer 403 increases in voltage which is
determined by an impedance ratio with respect to the
photoconductive layer 404, and thus increases in photo reflectance.
Accordingly, while a front surface 4a of the display recording
medium 4 is being irradiated with illumination light 41, the region
of the liquid crystal layer 403 which is irradiated with the write
pattern light 40 increases in reflectance, and thus reflects the
illumination light 41 and looks white. In contrast, the region
which is not irradiated with the write pattern light 40 looks black
since the illumination light 41 is transmitted through the liquid
crystal layer 403 and absorbed by the light absorption layer 405,
and reflected light 43 can be seen as an image from direction E.
This image is held for a long time even after extinction of the
voltage application to the receiving ends 407.
[0056] (6) Separation of LCD Holder from Write Position
[0057] Upon completion of the operation of writing to the display
recording medium 4 by the LCD driver 36, the control section 20
rotationally drives the not-shown lift motor of the lift driver 33
in the forward direction. As shown in FIG. 4C, the cams 305A and
305B are thus rotated about the rotary shafts 308 from direction A
to B to incline the LCD holder 307 from the solid line position to
dashed line position of FIG. 4C.
[0058] (7) Transport-out of Display Recording Medium
[0059] The control section 20 rotationally drives the not-shown
transport motor of the medium transporter 32 in a reverse direction
at the same time as driving the lift driver 33 or after a
predetermined time elapses from the start of driving the lift
driver 33. The transport rollers 303A, 303B, 304A, and 304B are
thus rotated in reverse to transport the display recording medium 4
out to the insertion slot 5. The control section 20 stops the
rotation of the transport rollers 303A, 303B, 304A, and 304B as the
medium detection sensor 31 detects the passage of the display
recording medium 4.
[0060] (8) Rotation of LCD Holder to Write Position
[0061] After stopping the transport motor, the control section 20
rotationally drives the lift motor of the lift driver 33 in the
reverse direction. The cams 305A and 305B are thus rotated from
direction B to A to rotate the LCD holder 307 from the dashed line
position to solid line position of FIG. 4C.
[0062] (9) Take-out of Display Recording Medium
[0063] The user pulls out the display recording medium 4 exposed
out of the insertion slot 5, by hand, from the image write unit 3.
The write to the display recording medium 4 is completed therewith
and, under the illumination light 41, the user can observe an image
formed by a letter or still image that is written to the image
write display region 4c of the display recording medium 4.
[0064] According to the first embodiment, during transport of the
display recording medium 4 into or out of the write position, the
LCD holder 307 is separated from the write position, thereby making
it harder for the surface of the LCD panel 35 to be scratched.
Besides, the LCD holder 307 is rotated to separate it from the
write position, thus enabling a simplification in configuration and
a reduction in size of the apparatus. Furthermore, the display
recording medium 4 provides the front surface 4a with a write
surface and an observation surface, so that a rear surface 4b can
be used as a print surface. Besides, the transport rollers 303A,
303B, 304A, and 304B are disposed so as not to pass over the image
write display region 4c of the display recording medium 4, thus
making it possible to prevent the image write display region 4c
from being damaged. Furthermore, the compression spring 306 is
disposed at a position farther away from the rotary shafts 308 than
the center of the LCD panel 35, so that a small spring force will
be suffice, which can reduce the rigidity of the LCD holder
307.
Second Embodiment
[0065] FIG. 7 shows an image write unit according to a second
embodiment of the invention. The second embodiment is configured
different from the first embodiment in the following respect. That
is, the projecting pieces 302A and 302B and the cams 305A and 305B
are disposed nearer the side of the LCD holder 307 in the advancing
direction of the display recording medium 4. And, the projecting
piece 311 and the compression spring 306 are disposed at the center
of the LCD holder 307. Furthermore, the rotary shafts 308 are
disposed nearer the center of the LCD holder 307 instead of at the
end thereof. And, the other configuration is the same as that of
the first embodiment. Additionally, in FIG. 7, the guide members
301A and 301B and the like are omitted from the illustration.
[0066] In this second embodiment, when the display recording medium
4 is transported into the write position, the control section 20
and the lift driver 33 rotate the cams 305A and 305B in direction
C. End portions of the LCD holder 307 on the sides of the stoppers
309A and 309B are thereby lifted, and end portions of the LCD
holder 307 on the transport-in side of the display recording medium
4 are thus lowered against the spring force of the compression
spring 306. The entire LCD holder 307 is thereby inclined, thus
forming a space between the LCD holder 307 and the display
recording medium 4 transported in.
[0067] When the display recording medium 4 is transported into the
write position, the cams 305A and 305B are rotated in direction D,
and the LCD holder 307 is pushed up by the compression spring 306
to bring the LCD panel 35 into proximity to or into close contact
with the display recording medium 4.
[0068] According to this second embodiment, similar to the first
embodiment, the surface of the LCD panel 35 can be prevented from
being scratched, and the cams 305A and 305B are disposed rearwardly
of the LCD holder 307, so that the image write unit 3 can be
reduced in size in its width direction.
Third Embodiment
[0069] FIG. 8A to 8E show an image write unit according to a third
embodiment of the invention. FIG. 8A shows the state of the image
write unit before the display recording medium 4 is transported in;
FIG. 8B shows the state of the image write unit immediately after
the display recording medium 4 is inserted; FIG. 8C shows the state
of the image write unit after the display recording medium 4 is
completed being transported in; FIG. 8D is a section view taken
along line 8D-8D of FIG. 8A; and FIG. 8E is a section view taken
along line 8E-8E of FIG. 8A.
[0070] This third embodiment is configured different from the first
embodiment in the following respect. That is, the projecting pieces
302A and 302B are eliminated from the LCD holder 307 and,
furthermore, the cams 305A and 305B are eliminated. In addition
thereto, a lift roller 313 serving as the rotary member is disposed
in an end portion of the LCD holder 307 on the insertion side of
the display recording medium 4, and a receiving member 320 that
receives the lift roller 313 is attached to the guide members 301A
and 301B. The other configuration is the same as that of the first
embodiment.
[0071] The lift roller 313, made up of a non-metal material such as
rubber or plastic, is rotatably attached to the LCD holder 307.
[0072] (Operation of Image Forming Apparatus)
[0073] The operation of the image forming apparatus 100 will now be
described.
[0074] (1) Insertion of Display Recording Medium When, as shown in
FIG. 8A, the display recording medium 4 is inserted between the
guide members 301A and 301B from the right as seen in the figure,
as shown in FIG. 8B, the leading end of the display recording
medium 4 rides over the lift roller 313 and thus depresses the lift
roller 313 against the spring force of the compression spring 306.
A gap of such a size that the display recording medium 4 makes no
contact with the surface of the LCD panel 35 is thereby provided
under the lower surface of the display recording medium 4.
[0075] (2) Transport-in of Display Recording Medium
[0076] When the display recording medium 4 is further inserted and
the medium detection sensor 31 detects the further insertion, the
control section 20 drives the not-shown transport motor to rotate
the transport rollers 303A, 303B, 304A, and 304B. The leading end
of the display recording medium 4 abuts the stopper 309A, and the
display recording medium 4 is thus transported to the write
position shown in FIG. 8C. Simultaneously therewith, the LCD holder
307 is brought into proximity to or into close contact with the
display recording medium 4 by the spring force of the compression
spring 306.
[0077] (3) Image Write
[0078] Next, the user operates the PC 1 to select an image intended
to be written to the display recording medium 4. When the user then
gives an instruction to write the image, similar to the first
embodiment, the display recording medium 4 is initialized, and
thereafter the image is written to the image write display region
4c of the display recording medium 4.
[0079] (4) Transport-out of Display Recording Medium
[0080] Upon completion of the operation of writing to the display
recording medium 4 by the LCD driver 36, the control section 20
rotationally drives the transport motor of the medium transporter
32 in the reverse direction. The transport rollers 303A, 303B,
304A, and 304B are thus rotated in reverse to transport the display
recording medium 4 out to the insertion slot 5. The control section
20 stops the rotation of the transport rollers 303A, 303B, 304A,
and 304B as the medium detection sensor 31 detects the passage of
the display recording medium 4. On this occasion, the display
recording medium 4 becomes supported and sandwiched between the
lift roller 313 and the receiving member 320.
[0081] (5) Take-out of Display Recording Medium
[0082] The user pulls out the display recording medium 4 exposed
out of the insertion slot 5, by hand, from the image write unit 3.
The LCD holder 307 is restored to the position shown in FIG.
8A.
[0083] According to this third embodiment, the surface of the LCD
panel 35 can be prevented from being scratched, and the need for
the lift motor that rotates the LCD holder 307 is eliminated.
Therefore, the configuration can be further reduced in size and
simplified as compared with the first embodiment. Additionally,
lift rollers 313 may be disposed on each of the right and left
sides in such a manner as not to pass over the image write display
region 4c of the display recording medium 4. This can prevent the
image write display region 4c from being damaged.
Fourth Embodiment
[0084] FIG. 9A to 9E shows an image write unit according to a
fourth embodiment of the invention. FIG. 9A shows the state of the
image write unit before the display recording medium 4 is
transported in; FIG. 9B shows the state of the image write unit
immediately after the display recording medium 4 is inserted; FIG.
9C shows the state of the image write unit after the display
recording medium 4 is completed being transported in; FIG. 9D is a
section view taken along line 9D-9D of FIG. 9A; and FIG. 9E is a
section view taken along line 9E-9E of FIG. 9A.
[0085] This fourth embodiment is configured different from the
third embodiment in the following respect. That is, in place of the
lift roller 313, a semicircular depressing member 314 made of resin
or the like is disposed as a low-friction member. And, a recessed
portion 320a is provided in the receiving member 320 attached to
the guide members 301A and 301B. The other configuration is the
same as that of the third embodiment.
[0086] The depressing member 314, having a half-column shape
obtained by halving a columnar shape, is fixedly mounted on the
upper surface of the LCD holder 307. The depressing member 314 may
be integrally formed of resin or the like with the LCD holder 307
by injection molding. Besides, the depressing member 314 may be
integrally formed of metal such as aluminum with the LCD holder
307, and the surface of the depressing member 314 may be coated
with resin such as tetrafluoroethylene resin.
[0087] (Operation of Image Forming Apparatus)
[0088] When, as shown in FIG. 9A, the display recording medium 4 is
inserted between the guide members 301A and 301B from the right as
seen in the figure, as shown in FIG. 9B, the leading end of the
display recording medium 4 rides over the upper surface of the
depressing member 314 and thus depresses the depressing member 314.
A gap of such a size that the display recording medium 4 makes no
contact with the surface of the LCD panel 35 is thereby provided
under the lower surface of the display recording medium 4.
[0089] When the display recording medium 4 is further inserted and
the medium detection sensor 31 detects the further insertion, the
control section 20 drives the not-shown transport motor to rotate
the transport rollers 303A, 303B, 304A, and 304B. The leading end
of the display recording medium 4 abuts the stopper 309A, and the
display recording medium 4 is thus transported to the write
position shown in FIG. 9C. The subsequent operation is similar to
that of the third embodiment, and thus is omitted from the
description.
[0090] According to this fourth embodiment, the LCD holder 307 has
a greater depression angle than in the third embodiment, so that,
even when a curved display recording medium 4 is used, the LCD
panel 35 can be prevented from scraping thereagainst. Additionally,
depressing members 314 may be disposed on each of the right and
left sides in such a manner as not to pass over the image write
display region 4c of the display recording medium 4.
Fifth Embodiment
[0091] FIG. 10 shows an image write unit according to a fifth
embodiment of the invention. This fifth embodiment is configured
different from the first embodiment in the following respect. That
is, a tension spring 318 is used in place of the compression spring
306, and this tension spring 318 is fastened between the projecting
piece 311 provided on the LCD holder 307 and the projecting piece
317 provided on the guide member 301B. The other configuration is
the same as that of the first embodiment.
[0092] According to this fifth embodiment, when the display
recording medium 4 is transported in, the LCD holder 307 is
depressed by the cams. And, after the display recording medium 4 is
transported to the write position, the LCD holder 307 is pulled
upward by the tension spring 318, thus bringing the LCD panel 35
into close contact with the display recording medium 4. Therefore,
similar to the first embodiment, the surface of the LCD panel 35
can be prevented from being scraped.
Sixth Embodiment
[0093] FIG. 11 shows an image write unit according to a sixth
embodiment of the invention. This sixth embodiment is configured
different from the third embodiment shown in FIG. 8A to 8E in the
following respect. That is, the lift roller 313 is replaced with a
roller 319 that is rotatably disposed at an angle .theta. to the
direction of width of the display recording medium 4. The other
configuration is the same as that of the third embodiment.
[0094] In FIG. 11, when the display recording medium 4 is inserted
from the insertion slot 5 of the image write unit 3, in the process
where the leading end of the display recording medium 4 is riding
over the roller 319, the display recording medium 4 depresses the
roller 319 against the spring force of the compression spring 306,
thereby depressing the LCD holder 307.
[0095] Furthermore, since the roller 319 is attached at a slant,
the display recording medium 4 is drawn to the inner side of the
guide member 301A in the process of being transported, which
prevents the display recording medium 4 from being inclined.
Besides, a space occurs between the display recording medium 4 and
the LCD holder 307, so that the display recording medium 4 is
transported without scraping the surface of the LCD panel 35.
[0096] According to this sixth embodiment, the LCD panel 35 can be
prevented from being scraped by the display recording medium 4.
Besides, the roller 319 disposed at a slant can prevent the display
recording medium 4 from being inclined. Therefore, the display
recording medium 4 can be smoothly transported, and an image to be
recorded can be prevented from being inclined.
Seventh Embodiment
[0097] FIG. 12A to 12C shows an image write unit according to a
seventh embodiment of the invention. FIG. 12A is a section view
taken along line A-A of FIG. 3, FIG. 12B is a section view taken
along line B-B of FIG. 3, and FIG. 12C is a section view taken
along line C-C of FIG. 3.
[0098] This seventh embodiment is configured different from the
first embodiment in the following respect. That is, the stoppers
309A and 309B are omitted, and a medium detection sensor 39 is
disposed in their place. The leads 34 are adapted to be moved up
and down by a solenoid 38, and a discharge slot 6 for discharging
the display recording medium 4 is disposed at the rear of the
casing 310. The display recording medium 4 can thus be transported
out of the rear of the casing 310.
[0099] When the display recording medium 4 is transported and the
medium detection sensor 39 at the rear detects the leading end of
the display recording medium 4, the control section 20 stops the
not-shown transport motor. Then, the leads 34 are lowered by the
solenoid 38 to abut the receiving ends 407, and an image is written
to the image write display region 4c. Thereafter, the transport
motor is rotationally driven in the forward direction to transport
the display recording medium 4 out to the discharge slot 6. The
operations of the LCD holder 307 and the like are the same as those
of the first embodiment, and thus are omitted from the
description.
[0100] According to this seventh embodiment, the LCD panel 35 can
be prevented from being scraped by the display recording medium 4.
And, the display recording medium 4 is adapted to be transported
out of the discharge slot 6 provided in the same direction as the
transport-in direction. Therefore, write processing can be
efficiently performed.
Eighth Embodiment
[0101] FIG. 13 shows an image write unit according to an eighth
embodiment of the invention. This eighth embodiment is configured
different from the first embodiment in the following respect. That
is, the light source 37, LCD holder 307, and the like are disposed
upside down with respect to the guide members 301A and 301B. The
other configuration is the same as that of the first embodiment.
According to this eighth embodiment, similar to the first
embodiment, the LCD panel 35 can be prevented from being scraped by
the display recording medium 4. And, the display recording medium 4
is inserted, with the image write display region 4c upward, into
the insertion slot 5 of the casing 310 and, after a write, is
discharged with the same orientation through the discharge slot 5.
Therefore, the written image can be immediately observed.
[0102] Additionally, even in the second to seventh embodiments,
similar to the eighth embodiment, the upside-down configuration can
be adopted. In this case, the recessed portion 320a is replaced
with a through hole, thereby making it possible to prevent dust,
dirt, and the like from accumulating therein.
Ninth Embodiment
[0103] FIG. 14A to 14C shows an image write unit according to a
ninth embodiment of the invention. In this ninth embodiment,
similar to the eighth embodiment, the light source, LCD holder, and
the like are disposed upside down with respect to the guide members
as compared with in the first embodiment.
[0104] This ninth embodiment has the LCD holder 307 that holds the
LCD panel 35 and a guide plate 322 that receives the display
recording medium 4 from below. Additionally, the guide members 301A
and 301B, medium detection sensor 31, stoppers 309A and 309B, and
the like are omitted from the illustration.
[0105] The LCD holder 307 has the rotary shafts 308 projecting from
its right and left sides, and the position on which the compression
spring 306 acts is taken up at a position farther away from the
rotary shaft 308 than the center of the LCD panel 35. This can
reduce the spring force of the compression spring 306, thus making
it possible to reduce the rigidity of the LCD holder 307. Besides,
the LCD holder 307 has the leads 34 disposed thereon or an opening
307a formed therein. Furthermore, there are provided lift rollers
321 that lift the LCD holder 307.
[0106] The guide plate 322, made of light metal such as aluminum,
has the surface coated with a resin of tetrafluoroethylene or the
like. And, notches 322a are provided in the guide plate 322 so as
to escape from the lift rollers 321. Additionally, the guide plate
322 may be formed entirely of resin.
[0107] According to this ninth embodiment, the use for the lift
motor that rotates the LCD holder 307 can be eliminated, which can
reduce the size of the configuration. Besides, the notches 322a are
provided in the guide plate 322, thereby making it possible to
increase the lift angle of the LCD holder 307. Therefore, even when
the curved display recording medium 4 is used, the LCD panel 35 can
be prevented from being scraped thereby. Besides, the transport
rollers 303A, 303B, 304A, and 304B and lift rollers 321 are
disposed on the right and left sides in such a manner as not to
pass over the image write display region 4c of the display
recording medium 4. Therefore, the image write display region 4c
can be prevented from being damaged.
Tenth Embodiment
[0108] FIG. 15 shows the layer configuration of a display recording
medium according to a tenth embodiment of the invention. The
display recording medium 4 of this tenth embodiment is of such a
type that the direction of irradiation of the write pattern light
and the direction of observation are reverse to those in the
display recording medium 4 of the first embodiment. And, the entire
configuration and the like of the image write unit 3 is the same as
those of the first embodiment.
[0109] As shown in FIG. 15, this display recording medium 4 is
configured different from that of FIG. 6 in that the separation
layer is eliminated and the photoconductive layer 404 and the light
absorption layer 405 are replaced with each other. The other
configuration is the same as that of FIG. 6.
[0110] An image write to this display recording medium 4 is
performed as follows. That is, an image write region 4d is
irradiated with the write pattern light 40 from the rear surface 4b
side and, furthermore, a predetermined voltage is applied to the
pair of receiving ends 407 via the leads 34 from the LCD driver 36.
Additionally, the written image can be observed from direction E
shown in FIG. 13.
[0111] According to this tenth embodiment, similar to the first
embodiment, the LCD panel 35 can be prevented from being scraped by
the display recording medium 4. And, the display recording medium 4
is inserted, with the image write display region 4e upward, into
the insertion slot 5 of the casing 310 and, after a write, is
discharged with the same orientation through the insertion slot 5.
Therefore, the written image can be immediately observed. Besides,
the image write unit of the tenth embodiment can be applied to
those of the first to ninth embodiments.
Other Embodiments
[0112] Additionally, the invention is not limited to each afore
said embodiment, but can be modified in various ways without
departing from the point of the invention. The components of each
embodiment can be arbitrarily combined without departing from the
point of the invention.
[0113] According to the image forming apparatus, by the
transport-in and-out of the display recording medium, the image
light emitting device side is brought out of contact with the
display recording medium before the display recording medium is
disposed at the write position, and is brought into proximity to
the display recording medium at the write position. An image write
is thereby achieved while preventing the contact therebetween.
Additionally, various display devices of electric field drive type,
such as a liquid crystal layer, an electrophoresis layer, and an EL
layer, can be used as the display layer on which the image is
displayed in response to the electric field distribution generated
by irradiating the photoconductive layer with the two-dimensional
image light.
[0114] The configuration maybe such that the image light emitting
device is held by a holder that is pivotally supported so as to be
rotatable on the side thereof in the transport-in direction of the
display recording medium, and such that the separating/contacting
unit includes rotating unit that rotates the holder to bring it out
of contact with the write position. The image light emitting device
may be moved in a direction perpendicular to the image light
emitting surface, but the separating/containing mechanism can be
simplified in configuration by rotating the image light emitting
device.
[0115] The rotating unit may be configured to include a spring
member that presses the holder against the display recording medium
side and a rotation driver that separates the holder from the
display recording medium against the pressing force of the spring
member. The spring member is used as the member that presses the
holder against the write position side, thereby obtaining stable
pressing force. Various springs can be used as the spring member
such as a compression spring, a tension spring, a leaf spring, a
torsion spring, a spiral spring and a conical spring washer. In
this case, the rotation driver may be configured to include a cam
that separates the holder from the display recording medium and a
cam driver that rotationally drives the cam. Such a cam mechanism
can accurately rotate the holder. As the cam, various cams can be
used such as an eccentric cam and a plate cam.
[0116] The rotating unit may be configured to include a rotary
member that, disposed on the holder, separates the holder from the
display recording medium by the operation of transport-in and -out
of the display recording medium. According to this configuration,
it is possible to omit a drive system for rotating the holder.
[0117] As the rotary member, a low-friction member that is in
slidable contact with the display recording medium to separate the
holder from the display recording medium or a rotary member that is
in rolling contact with the display recording medium to separate
the holder from the display recording medium can be used. The
low-friction member may be formed entirely of resin, may be a metal
or the like of which surface is coated with a resin such as a
tetrafluoroethylene resin, or may be formed integral with the
holder.
[0118] Besides, the rotary member may be a roller that is disposed
inclined to the transport-in direction of the display recording
medium. This causes a component force in a direction inclined to
the transport direction of the display recording medium. Therefore,
a pair of guide members are disposed one on each side of the
display recording medium, so that the display recording medium is
pushed by one of the guide members, and thus can be prevented from
being inclined.
[0119] The rotating unit may separate the holder downwardly from
the display recording medium in conjunction with the transport-in
and -out of the display recording medium. This facilitates
supporting of the holder, thus improving a reduction in size of the
rotating mechanism.
[0120] The transport unit may be configured to transport the
display recording medium inserted in the insertion slot into the
write position, and to transport the display recording medium
written with the image out to the insertion slot. The electrodes in
contact with the display recording medium can thereby be held in a
fixed state.
[0121] The transport unit may be configured to transport the
display recording medium inserted in the insertion slot into the
write position, and to transport the display recording medium
written with the image out to a discharge slot provided at a
position that is in the transport-in direction of the display
recording medium. The display recording medium is transported out
in its transport-in direction, thereby making it possible to
efficiently perform write processing.
[0122] A flat display is preferably used as the image light
emitting device. The apparatus can be reduced in thickness by using
a thin-shaped display. As the flat display, various display can be
used, for example, an LCD (Liquid Crystal Display), an ELD (Electro
Luminescence Display), a PDP (Plasma Display Panel), a VFD
(Fluorescent Display Tube Display), an LED (light Emitting Diode)
display, and an FED (Field Emission Display).
[0123] According to embodiments of the present invention, the write
light emitting surface side of the image light emitting device is
brought separate from and into contact with the display recording
medium transported by the transport unit from the insertion portion
to the write position. This needs a smaller movable range of the
separating/contacting mechanism than in the configuration where the
display recording medium transport mechanism is moved as a whole,
as a result of which the entire apparatus can be reduced in
thickness. A simplification in configuration also becomes
advantageous to reduce the size of the apparatus. While thus
achieving the reduction in size, it is possible to prevent the
image light emitting device from being damaged by the display
recording medium being transported.
[0124] The entire disclosure of Japanese Patent Application No.
2005-135861 filed on May 9, 2005 including specification, claims,
drawings and abstract is incorporated herein by reference in its
entirety.
* * * * *